Multifrequency interferometric particle imaging for gas bubble sizing

Abstract

A new configuration for measuring bubbles with ILIDS (Interferometric Laser Imaging for Droplet Sizing) is proposed. In this configuration, perpendicularly polarized light scattered by a bubble is gathered at 90 •. In this signal, two dominant frequencies are present, whose origin is explained and experimentally verified. Numerical simulations demonstrate how this frequency signature can be used to improve the robustness of the standard ILIDS technique and reject non-spherical bubbles.

Interferometric laser imaging for droplet sizing revisited: elaboration of transfer matrix models for the description of complete systems

“…It should thus allow development of a setup that can give the size and the three-dimensional positions of droplets, as can do holography and digital phase contrast techniques [32,33]. It further offers the possibility of future improvements, such as the description of multifrequency interferometric particle imaging for gas bubble sizing [34]. Each part of an optical system can be represented by a matrix.…”

Interferometric out-of-focus imaging simulator for irregular rough particles

“…But we think that this simulator should allow to obtain more details concerning the form of the particle in the future (as the existence of specific symmetries of the object for example). Another important perspective is the extension to multifrequency interferometric particle imaging to enhance the accuracy of the characterization of the particles [25].…”

Laser marked shadowgraphy: a novel optical planar technique for the study of microbubbles and droplets

“…• as was described in Dehaeck and van Beeck (2007a), Dehaeck and van Beeck (2007b) and in Kawaguchi and Maeda (2005). Such measurements also have a well-defined measurement volume, which is similarly displaced and dependent on the bubble diameter in the case of a Gaussian intensity profile of the laser-sheet.…”

“…Finally, LMS is a more robust technique due to the redundancy offered by the combination of backlighting with GPVS. In IPI measurements, no redundancy is typically present (except for the set-up introduced in Dehaeck and van Beeck (2007b)) and fringe patterns arising from spuriously reflected glare points or overlapping out-of-focus discs can lead to misinterpretations.…”